Product data

Chapter 12. High availability and redundancy 301
򐂰 For an environment where the SDMC is used for agent OS management and
there is a high availability requirement for that functionality, SDMC High
Availability is needed. If your active SDMC fails, the passive standby SDMC
automatically takes over and management functionality for the managed
systems is restored in about 10 minutes. There are some extra planning,
setup, and administrative steps required to implement SDMC High
Availability.
Table 12-1 shows the differences between redundant HMCs and IBM Systems
Director high availability setup.
Table 12-1 Differences between a redundant and a replication High Availability
environment
In a redundant setup, it is also possible to have one SDMC point to another
SDMC’s agent manager, which would allow both SDMCs to manage the agents
at the same time. However, because the agent manager is running on only one
of the SDMCs, this is a single point of failure. If this SDMC goes down, the other
SDMC now loses contact with the agents.
HMC SDMC with
redundancy
Systems Director
or SDMC with
High Availability
Type of
environment
Redundant. Redundant. Replication.
High availability
topology
Active/Active: Both
consoles are active
at the same time.
Active/Active: Both
consoles are active
at the same time.
Active/Passive:
Only one console is
active at a time.
Data Data is not
identical.
Data is not
identical.
All data is identical
on the two nodes.
Management
Console
HMC. Systems Director. Systems Director.
Console versions Can be different. Can be different. Must be the same.